// Copyright (c) 2010-2012, Tetsuo Kiso
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
//  * Redistributions of source code must retain the above
//    copyright notice, this list of conditions and the
//    following disclaimer.
//
//  * Redistributions in binary form must reproduce the above
//    copyright notice, this list of conditions and the
//    following disclaimer in the documentation and/or other
//    materials provided with the distribution.
//
//  * Neither the name of Tetsuo Kiso nor the names of its contributors
//    may be used to endorse or promote products derived from this software
//    without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "feature.h"

#include <fstream>
#include "random.h"
#include "tokenizer.h"
#include "logging.h"

namespace arowpp {

bool Features::Open(const char* filename) {
  std::ifstream ifs(filename);
  if (!ifs) {
    LOG(ERROR) << "no such file or directory " << filename;
    return false;
  }

  std::size_t line_num = 0;
  std::string line;

  while (std::getline(ifs, line)) {
    ++line_num;
    if (line[0] == '#' || line.empty()) continue;
    short label = 0;                      // true label
    fv_t vec;

    if (!Tokenizer::Tokenize(line.c_str(), &vec, &label, &maxid_)) {
      LOG(ERROR) << "Invalid line: " << line_num;
      return false;
    }
    features_.push_back(std::make_pair(vec, label));
  }
  return true;
}

void Features::Shuffle() {
  ShuffleRandom(features_);
}

} // namespace arowpp
